Analysis of tee usage

Usage of tee: tee [Option]... [file]... copy the standard input to each specified file and display it to the standard output grep-r-I-E "sss | aaa ". /| grep-v. /doc/| tee-a log.txt grep-E is matched by regular expression www.2cto.com grep-r is a recursive directory grep-v is excluded from some subdirectories. The tee-a content is appended to the given file rather overwrite description: query all files containing sss or aaafiles in this directory, except for the docdirectory. Then, log the data information to the log.txt file.